Battery terminal

Abstract: A battery terminal includes a main member (11) and ring member (12), each made from a conductive metal. A stud bolt (14) for cable connection projects from the main member. A post fitting (12a) is provided in the ring member. The ring member is placed on top of the main member with one end of the ring member supported by the main member and the other end at an angle floating free above the main member. This other end is passed over the stud bolt and the post fitting (12a) of the ring member is fit over the battery post (1). The battery cable terminals (T1, T2) are fit onto the stud bolt. When the nut (15) is tightened on the stud bolt (14), the terminals (T1, T2) are tightened against the ring member, which is at an angle to the battery post, and the post fitting of the ring member is forced down and clamped against the battery post. Thus, securing the battery terminal to the battery post and securing the cable terminals to the battery terminal can be simultaneously completed by a single thread tightening operation.

Description: BACKGROUND OF THE INVENTION 1. Field of the invention The present invention relates to a battery terminal mounted to the battery post of a battery installed in a motor vehicle, and relates specifically to a battery terminal whereby the task of securing the battery terminal to the battery post and the task of securing the terminal to the cable connector of the battery terminal can be accomplished by a single thread tightening operation. 2. Description of the prior art In a conventional battery terminal of this type (JP-A-3-16 214), the task of securing the battery terminal to the battery post and the task of securing the cable-side connecting terminal to the cable connector of the battery terminal are separate tasks. As shown in Fig. 11, the battery terminal is made from a single metal member, and comprises a ring-shaped post fitting 2 of which one end is open and which is formed to fit over the battery post 1, clamping members 3a and 3b contiguous on both sides to the open ends of the post fitting 2, and a cable connector 4 contiguous to the closed side of the post fitting 2. In a stud type battery terminal of this type wherein a stud bolt 5 projects from the cable connector 4, the bolt holes of the terminals T1 and T2 separately crimped to the cables W1 and W2 connected to the battery are passed over the stud bolt 5 and clamped from above by a nut 6. The post fitting 2 is similarly fit over the battery post 1, and a nut 8 is tightened onto the bolt 7 previously passed through the clamping members 3a and 3b, thus closing the open end of the post fitting 2 contiguous to the clamping members 3a and 3b, and thereby clamping the post fitting 2 securely to the battery post 1. With this conventional battery terminal, however, an impact wrench or similar tool is used from the side to clamp the battery terminal to the battery post. In most late-model passenger vehicles, however, the engine room is extremely crowded, and the proximity of other components makes it difficult to adequately tighten the post fitting by applying a horizontal force because of interference from other components. It is even possible for the impact wrench to contact the negative terminal while tightening the positive post fitting, possibly causing an electrical short which, in a worst-case scenario, could cause an engine room fire. In addition, this battery terminal design requires separate tasks to secure the battery terminal to the battery post and secure the battery cable terminal to the cable connector of the battery terminal. The separation of these tasks increases the total time required to complete both. It is also necessary to consider the assembly sequence when designing the battery terminal, and the location of the cable connectors must be carefully considered to prevent interference between the air ducts and other components with the cable connector, cable terminals, and cables while assembling the battery terminal to the battery post. These limitations noticeably reduce the degree of freedom in battery and terminal design. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a battery terminal whereby productivity can be increased by completing connection of the cable terminal to the battery terminal and securing the battery terminal to the battery post in a single operation, and whereby the degree of freedom in battery terminal design is increased by positioning the cable connector and the battery cable in a direction preventing interference with other components during assembly of the battery terminal to the battery post. This object is achieved with the features indicated in claim 1. Useful detail of the invention are specified in the dependent claims. A battery terminal for connecting a battery post to a cable, according to one preferred embodiment of the present invention comprises a main member, a ring member and a nut. The main member is a flat piece of metal and comprises: a post fitting portion having a battery post fitting hole for receiving the battery post therein; a ring support provided continuous to one side of the post fitting portion; a cable connector portion provided continuous to other side of the post fitting portion; and a stud bolt projecting vertically upward from said cable connector portion. The ring member placed over said main member, comprises: a post fitting portion having a battery post fitting hole for receiving the battery post therein and a truncated cone-shaped clamping piece projecting upward around the inside edge of the battery post fitting hole; a clamping member on one side of the post fitting portion; and a cable connector portion with a bolt hole on other side of the post fitting portion through which said stud bolt is inserted, said cable connector portion being bent at a predetermined angle with respect to said post fitting portion. The nut is mounted onto said stud bolt, whereby the battery terminal is assembled such that the end of the clamping member of the ring member is supported by the ring support of the main member, and the post fitting portion of the ring member is inclined relative to the main member, and such that tightening the nut onto the stud bolt clamps the cable terminal to the ring member and simultaneously pushes the clamping piece of the ring member fit at an angle over the battery post down against the battery post. Because the post fitting of the ring member is fit over the battery post at an angle and a nut is then tightened to deform the post fitting coaxially to the battery post while pushing the post fitting down, a slit is also provided in the clamping member side of the post fitting of the ring member, and a slit continuous to said slit is provided through the widthwise center of the clamping member to divide the clamping member into two right and left clamping pieces. Alternatively, the bolt hole provided in the cable connector of the ring member may be an oval. A seal member attached to the bottom of the main member is also provided. When the above slits are provided in the ring member, engaging members engaging the outside faces of the clamping pieces separated by the slit project from the flexible seal member. A battery terminal according to a second embodiment of the invention comprises a main member, a ring member and a nut. The main member is a flat piece of metal and comprises: a post fitting portion having a battery post fitting hole for receiving the battery post therein; a truncated semiconical clamping piece projecting at one side of the inside face of the battery post fitting hole; a ring support provided continuous to one side of the post fitting portion; a cable connector portion provided continuous to other side of the post fitting portion; and a stud bolt projecting vertically upward from said cable connector portion. The ring member placed over said main member, comprises: a post fitting portion having a battery post fitting hole for receiving the battery post therein and a truncated semiconical clamping piece projecting at one side of the inside edge of the battery post fitting hole on a side opposite that of the semiconical clamping piece of the main member; a clamping member on one side of the post fitting portion; and a cable connector portion with a bolt hole on other side of the post fitting portion through which said stud bolt is inserted, said cable connector portion being bent at a predetermined angle with respect to said post fitting portion. The nut is mounted onto said stud bolt, whereby the battery terminal is assembled such that the end of the clamping member of the ring member is supported by the ring support of the main member, and the post fitting portion of the ring member is inclined relative to the main member, and such that tightening the nut onto the stud bolt clamps the cable terminal to the ring member and simultaneously pushes the semiconical clamping piece of the ring member, which is fit at an angle over the battery post, down to clamp the battery post between the two clamping pieces of the ring member and the main member. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more fully understood from the detailed description given below and the accompanying diagrams wherein: Fig. 1 is a cross sectional side view of a battery terminal according to the first preferred embodiment of the present invention, particularly showing an operation to place the cable terminals and the battery terminal, Fig. 2 is a view similar to Fig. 1, but particularly showing the battery terminal when the cable terminals are secured to the battery terminal and the battery terminal is secured to the battery post, Fig. 3 is a top plan view of Fig. 2, Fig. 4 is a top plan view of the ring member of the battery terminal, Fig. 5 is a top plan view of the main member of the battery terminal, Fig. 6 is a top plan view of the seal member of the battery terminal, Fig. 7 is a cross sectional side view of a battery terminal according to the second embodiment of the present invention, particularly showing an operation to place the cable terminals and the battery terminal, Fig. 8 is a view similar to Fig. 7, but particularly showing the battery terminal of the second embodiment when the cable terminals are secured to the battery terminal and the battery terminal is secured to the battery post, Fig. 9 is a top plan view of the main member of the battery terminal according to the second embodiment, Fig. 10 is a top plan view of the ring member of the battery terminal according to the second embodiment, and Fig. 11 is a perspective view of a conventional battery terminal. DESCRIPTION OF PREFERRED EMBODIMENTS The preferred embodiments of a battery terminal according to the present invention are described below with reference to the accompanying figures, of which Figs. 1 - 6 show the first embodiment. A battery terminal 10 according to the present invention comprises a main member 11 (Fig. 5) and a ring member 12 (Fig. 4), both made of a conductive metal material. A flexible seal member 13 (Fig. 6) is attached to the bottom of the main member 11, and a clamping piece for clamping to the outside surface of the battery post is provided on the ring member 12. The main member 11 (Fig. 5) is made from a flat piece with a ring-shaped post fitting 11a having a battery post fitting hole 11e at the center of the main member 11 and the post fitting 11a. A rectangular cable connector 11b extends from one side of the post fitting 11a, and a ring support 11c extends from the other side. A stud bolt 14 projects vertically upward from the cable connector 11b, and a presser member 11d is bent upward at the end of the ring support 11c. The ring member 12 (Fig. 4) is also made from a flat piece with a post fitting 12a having a battery post fitting hole 12h at the center thereof. A cone-shaped clamping piece 12i projects upward around the inside edge of the battery post fitting hole 12h. A rectangular cable connector 12b extends from one side of the post fitting 12a, and a clamping member 12c extends from the other side. As shown in Fig. 1, the post fitting 12a and cable connector 12b are not provided in a straight line, but offset at a slight angle. A bolt hole 12d is also provided in the cable connector 12b. A slit 12e provided at the center of the post fitting 12a on the clamping member 12c side continues into the slit 12f running from the bottom of slit 12e through the center and to the outside end of the clamping member 12c. The clamping member 12c is thus divided into right and left clamping members 12c-1 and 12c-2 by the slit 12f. These right and left clamping members 12c-1 and 12c-2 are contiguous to the two sides of the opening in post fitting 12a, which is similarly divided by the slit 12e. The seal member 13 (Fig. 6) attached to the bottom of the main member 11 is shaped essentially like the main member 11: a ring member 13a provided at the center of the seal member 13 is flanked on both sides by flat members 13b and 13c. To attach the seal member 13 to the main member 11, two inverted L-shaped engaging tabs 13d are provided on opposing sides of the ring member 13a, and are spaced to engage the outside edge of the post fitting 11a of the main member 11. A third inverted L-shaped engaging tab 13e is provided at the end of the one flat member 13b to engage the end of the cable connector 11b part of the main member 11. Engaging members 13f and 13g similarly project up from the end and both sides of the other flat member 13c. The end engaging member 13f engages the outside face of the presser member 11d of the main member 11. The two side engaging members 13g engage the outside of the right and left clamping members 12c-1 and 12c-2 of the ring member 12 placed on the main member 11. The operation whereby the terminals T1 and T2 crimping the wires W1 and W2 are simultaneously secured to the battery terminal 10 and to the battery post 1 is described below. The battery terminal 10 is assembled by attaching the seal member 13 to the bottom of the main member 11, placing the ring member 12 on top of the main member 11, and inserting the ends of the clamping members 12c-1 and 12c-2 of the ring member 12 into the presser member 11d of the main member 11 with the outside sides of the clamping members 12c-1 and 12c-2 contacting the engaging members 13g of the seal member 13. The bolt hole 12d in the cable connector 12b of the ring member 12 is also passed over the stud bolt 14 projecting from the main member 11. While the bottoms of the clamping member 12c and post fitting 12a are in a straight line, the post fitting 12a is at an angle to the cable connector 12b. As a result, when the ring member 12 is assembled to the main member 11, the post fitting 12a is positioning at a rising slope from the pivot point of the presser member 11d stopping the ends of the clamping member 12c, and the cable connector 12b is thus positioned at a downward slope from the post fitting 12a as shown in Fig. 1. The assembled battery terminal 10 is then placed over the battery post 1. Specifically, the ring member 13a of the seal member 13, and the battery post fitting holes 11e and 12h of the ring-shaped post fitting 11a of the main member 11 and the post fitting 12a of the ring member 12, respectively, are fit over the battery post 1. The inside diameter of the ring member 13a of the seal member 13 and the battery post fitting hole 11e of the main member 11 is greater than the large diameter at the base of the conical battery post 1. As a result, the ring member 13a and battery post fitting hole 11e can be smoothly fit over the battery post 1, and the seal member 13 and main member 11 can be placed level and flat against the top of the battery as indicated in Fig. 1. The conical clamping piece 12i of the ring member 12, however, is sized to contact the outside face of the battery post 1, and while the clamping piece 12i fits over the top of the battery post 1, it cannot be easily seated. The post fitting 12a is also at an angle to the main member 11. The ring member 12, as a result, remains at an angle to the battery post 1 as shown in Fig. 1. With the seal member 13, main member 11, and ring member 12 thus assembled to the battery post 1 as shown in Fig. 1, the terminals T1 and T2 to be connected to the battery are slid onto the stud bolt 14, i.e., the bolt hole T1a of the one terminal T1 is fit onto the stud bolt 14 projecting from the cable connector 12b of the ring member 12, and the bolt hole T2a of the other terminal T2 is then fit onto the stud bolt 14 over the first terminal T1. A nut 15 is then threaded onto the stud bolt 14 and tightened with an impact wrench or similar tool (not shown in the figures) from above. When the nut 15 is tightened, the ring member 12 resting at an upward slope from the main member 11 is pushed down by the nut 15, thus horizontally displacing the post fitting 12a and clamping member 12c. As a result, the clamping piece 12i of the post fitting 12a fit over the battery post 1 is forced down coaxially to the battery post 1. While a force spreading the clamping piece 12i also operates at this time, the slit 12e in the clamping piece 12i and the slit 12f in the clamping member 12c allow the clamping members 12c-1 and 12c-2 to spread, thus absorbing the force acting on the clamping piece 12i. While the sides of the clamping members 12c-1 and 12c-2 contact the engaging members 13g of the seal member 13, the seal member 13 is made from a flexible material, thus permitting the engaging members 13g to be elastically deformed when the clamping members 12c-1 and 12c-2 are displaced to the outside. As a result, the seal member 13 is returned to its original shape due to its inherent resiliency when the external force acting on the clamping members 12c-1 and 12c-2 is alleviated, and restores the clamping members 12c-1 and 12c-2 to a gapless state. Specifically, the force spreading the clamping piece 12i is alleviated when the post fitting 12a and clamping member 12c have been pushed down to a horizontal position as shown in Fig. 2 by tightening the nut 15 because the clamping piece 12i of the post fitting 12a is dimensioned to contact the outside face of the battery post 1 when fully seated. As a result, the force separating the clamping members 12c-1 and 12c-2 connected to the clamping piece 12i is removed, the gap in the slit 12f is eliminated by the elastic restoring force of the engaging members 13g of the seal member 13, and the gap in the slit 12e in the post fitting 12a is also eliminated. It is therefore possible to secure the post fitting 12a to the battery post 1 by tightening the nut 15 to fasten the battery cable terminals T1 and T2 to the stud bolt 14. A second embodiment of the present invention is described below with reference to Figs. 7 - 10. In this embodiment clamping members fitting over and clamping to the battery post 1 are provided on both the main member 11 and the ring member 12, and a slit is not provided in the clamping member 12c of the ring member 12. Specifically, a semiconical clamping member 11f projects from the inside edge on one side of the battery post fitting hole 11e in the post fitting 11a of the main member 11 (Fig. 9), and a semiconical clamping member 12j projects from the inside edge on the opposite side of the battery post fitting hole 12h in the ring member 12. Other aspects of the configuration of the second embodiment are the same as in the first embodiment described above, and further description is therefore omitted below. In a battery terminal according to this second embodiment, the main member 11, ring member 12, and seal member 13 are assembled as shown in Fig. 7, the clamping member 11f of the main member 11 passes through the battery post fitting hole 12h of the ring member 12, and is therefore opposite the clamping member 12j of the ring member 12. When assembled as shown in Fig. 7, the battery post fitting holes in the seal member 13, main member 11, and ring member 12 are fit over the battery post 1. As in the first embodiment above, the terminals T1 and T2 are fit over the stud bolt 14, and a nut 15 is then tightened using an impact wrench or similar tool. When the nut 15 is tightened, the ring member 12 is forced down, thereby clamping the clamping member 12j of the ring member 12 against one side of the battery post 1 and the clamping member 11f of the main member 11 against the other side of the battery post 1. The battery post 1 is thus clamped between the two clamping members 11f and 12j, and the battery terminal is secured to the battery post. As will be known from the above description of the invention, the two tasks of securing the cable crimping terminals to the battery terminal and securing the battery terminal to the battery post can be accomplished by a single thread tightening operation, thereby improving job productivity. In addition, because the thread tightening operation is performed from above the battery post rather than horizontally to the battery post, interference between the tightening tool and other components is prevented during the thread tightening operation, and the problem of the tightening tool easily contacting other components is eliminated. In addition, because the cables are not connected to the battery terminal when assembling the battery terminal to the battery post, it is not necessary to consider interference between the cables and other components during battery terminal design, and it is sufficient to orient the battery terminal cable connector to prevent interference between the cable and other components when connecting the cable. As a result, the degree of freedom in battery terminal design is also increased. The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims: A battery terminal for connecting a battery post (1) to a cable (W1, W2), comprising: a main member (11) in the form of a substantially flat piece of metal having a post fitting portion (11a) for receiving the battery post (1) therein, and a cable connector portion (11b), a stud bolt (14) projecting vertically upward from said cable connector portion, a nut (15) to be screwed onto said stud bolt (14) for clamping a cable terminal (T1, T2) which has been fitted onto said stud bolt, and clamping means for clamping the main member (11) onto said battery post (1), characterized in that said clamping means comprise a ring member (12) made of metal and placed over said main member (11) and comprising a post fitting portion (12a) for receiving the battery post (1) therein and a cable connector portion (12b) adapted to be fitted around said stud bolt (14), said cable connector portion (12b) being bent at a predetermined angle with respect to the post fitting portion (12a) of the ring member, said post fitting portion being supported on the main member (11) such that, when the nut (15) is tightened for clamping the cable connector portions (11b, 12b) of the main member (11) and the ring member (12) and the cable terminals (T1, T2) together, the post fitting portion (12a) of the ring member is tilted to clamp the battery post (1). A battery terminal according to claim 1, wherein: the post fitting portion (11a) of the main member has a battery post fitting hole (11e) for receiving the battery post (1) therein, and an upturned and bent back support portion (11d) is provided on the side of the post fitting portion (11a) opposite to the cable connector portion (11b), the post fitting portion (12a) of the ring member (12) has a battery post fitting hole (12h) for receiving the battery post (1) therein and a truncated cone-shaped clamping piece (12i) projecting upward around the inside edge of the battery post fitting hole (12h), the cable connector portion (12b) of the ring member has a bolt hole (12d) through which said stud bolt (14) is inserted, the ring member member (12) further has a clamping member (12c) provided on the side of the post fitting portion (12a) opposite to the cable connector portion (12b), the post fitting portion (12a) of the ring member (12) is formed with a first slit (12e) along a side of the clamping member (12c), and the clamping member (12c) is formed with a second slit (12f) continuous to said first slit (12e) through a widthwise center of the clamping member (12c) to divide the clamping member into first and second clamping members (12c-1, 12c-2), whereby the battery terminal is assembled such that the post fitting portion (12a) of the ring member is held in an inclined position relative to the main member (11) such that the clamping piece (12i) is fit at an angle over the battery post (1), while the end of the clamping member (12c) of the ring member is supported by the support potion (11d) of the main member, so that the nut (15), when tightened, pushes the clamping piece (12i) down against the battery post. A battery terminal according to claim 1, wherein: the post fitting portion (11a) of the main member has a battery post fitting hole (11e) for receiving the battery post (1) therein, the main member further has a truncated semi-conical clamping piece (11f) projecting at one side of the inside face of the battery post fitting hole (11e), and upturned and bent back support portion (11d) provided on the side of the post fitting portion (11a) opposite to the cable connector portion (11b), the post fitting portion (12a) of the ring member (12) has a battery post fitting hole (12h) for receiving the battery post (1) therein, and a truncated semi-conical clamping piece (12j) projecting at one side of the inside edge of the battery post fitting hole (12h) on a side opposite to that of the semi-conical clamping piece (11f) of the main member (11), the cable connector portion (12b) of the ring member has a bolt hole (12g) through which the stud bolt (14) is inserted, the ring member (12) further has a clamping member (12c) provided on the side of the post fitting portion (12a) opposite to the cable connector portion (12b), whereby the battery terminal is assembled such that the post fitting portion (12a) of the ring member is held in an inclined position relative to the main member (11), so that the semi-conical clamping piece (12j) of the ring member is fitted at an angle over the battery post, while the end of the clamping member (12c) of the ring member is supported by the support potion (11d) of the main member, and the nut (15), when tightened, pushes the semi-conical clamping piece (12j) of the ring member down to clamp the battery post (1) between the two clamping pieces (12j, 11f) of the ring member and the main member. A battery terminal according to claim 1 or 2, further comprising a seal member (13) on which said main member (11) is placed, said seal member (13) having engaging members (13g) at opposite sides for engaging opposite edges of said clamping member (12c).

Inventors: AOYAMA MASAHIKO, AOYAMA, MASAHIKO, AOYAMA, MASAHIKO, C/O SUMITOMO WIRING SYSTEMS LTD.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1994
Main classification: H01R11
IPC codes: H01R11, H01M2